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    <title>Avast Threat Labs (@AvastThreatLabs): &quot;We have found a new #Linux #malware leveraging an open source kernel-mode rootkit #Suterusu and we dubbed it #HCRootkit. 1&#x2F;7&quot;|nitter</title>
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                      <span class="tweet-date"><a href="/AvastThreatLabs/status/1430527767855058949#m" title="Aug 25, 2021 · 1:49 PM UTC">25 Aug 2021</a></span>
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                <div class="tweet-content media-body" dir="auto">We have found a new <a href="/search?q=%23Linux">#Linux</a> <a href="/search?q=%23malware">#malware</a> leveraging an open source kernel-mode rootkit <a href="/search?q=%23Suterusu">#Suterusu</a> and we dubbed it <a href="/search?q=%23HCRootkit">#HCRootkit</a>. 1/7</div>
                <p class="tweet-published">Aug 25, 2021 · 1:49 PM UTC · Twitter Web App</p>
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                      <span class="tweet-date"><a href="/AvastThreatLabs/status/1430527769104900098#m" title="Aug 25, 2021 · 1:49 PM UTC">25 Aug 2021</a></span>
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                <div class="tweet-content media-body" dir="auto">Stage 1 is a dropper for the modified rootkit and a usermode component. The dropper is a backdoored coreutils binary that first extracts and runs the other components from itself and then continues normal execution of the host binary. 2/7</div>
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                      <span class="tweet-date"><a href="/AvastThreatLabs/status/1430527770392612868#m" title="Aug 25, 2021 · 1:49 PM UTC">25 Aug 2021</a></span>
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                <div class="tweet-content media-body" dir="auto">Stage 2, the usermode component is a backdoor written in C++. It has capabilities to create, delete and modify files and their metadata, execute arbitrary commands and steal credentials. It communicates with the CNC using protobuf and opens a simple SSH backdoor. 3/7</div>
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                      <span class="tweet-date"><a href="/AvastThreatLabs/status/1430527771634069505#m" title="Aug 25, 2021 · 1:49 PM UTC">25 Aug 2021</a></span>
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                <div class="tweet-content media-body" dir="auto">The main purpose of the rootkit component is to hide the stage 2 payload and ensure the traffic from the CNC is bypassing the firewall by installing a netfilter hook and redirecting the CNC packets to make it look like the packets are coming from localhost. 4/7</div>
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                      <span class="tweet-date"><a href="/AvastThreatLabs/status/1430527772850495492#m" title="Aug 25, 2021 · 1:49 PM UTC">25 Aug 2021</a></span>
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                <div class="tweet-content media-body" dir="auto">IoCs:
Domains:

ywbgrcrupasdiqxknwgceatlnbvmezti[.]com
yhgrffndvzbtoilmundkmvbaxrjtqsew[.]com
wcmbqxzeuopnvyfmhkstaretfciywdrl[.]name
ruciplbrxwjscyhtapvlfskoqqgnxevw[.]name
pdjwebrfgdyzljmwtxcoyomapxtzchvn[.]com 5/7</div>
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                      <span class="tweet-date"><a href="/AvastThreatLabs/status/1430527774037475329#m" title="Aug 25, 2021 · 1:49 PM UTC">25 Aug 2021</a></span>
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                <div class="tweet-content media-body" dir="auto">nfcomizsdseqiomzqrxwvtprxbljkpgd[.]name
hkxpqdtgsucylodaejmzmtnkpfvojabe[.]com
etzndtcvqvyxajpcgwkzsoweaubilflh[.]com
esnoptdkkiirzewlpgmccbwuynvxjumf[.]name

IPs:

172.96.231.69 6/7</div>
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                      <span class="tweet-date"><a href="/AvastThreatLabs/status/1430527775350263808#m" title="Aug 25, 2021 · 1:49 PM UTC">25 Aug 2021</a></span>
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                <div class="tweet-content media-body" dir="auto">SHA256s:

Dropper:
602c435834d796943b1e547316c18a9a64c68f032985e7a5a763339d82598915
Usermode component:
6187541be6d2a9d23edaa3b02c50aea644c1ac1a80ff3e4ddd441b0339e0dd1b
Rootkit:
10c7e04d12647107e7abf29ae612c1d0e76a79447e03393fa8a44f8a164b723d 7/7</div>
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              <a class="tweet-link" href="/sdotknight/status/1435985694128812034#m"></a>
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                        <a class="fullname" href="/sdotknight" title="Scott Knight">Scott Knight</a>
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                      <span class="tweet-date"><a href="/sdotknight/status/1435985694128812034#m" title="Sep 9, 2021 · 3:17 PM UTC">9 Sep 2021</a></span>
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                <div class="replying-to">Replying to <a href="/AvastThreatLabs">@AvastThreatLabs</a></div>
                <div class="tweet-content media-body" dir="auto">The kernel module init function seems very different from what I see here: <a href="https://github.com/mncoppola/suterusu">github.com/mncoppola/suterus…</a> is there another open source kernel module repository that you all thought was related?</div>
                <div class="card large"><a class="card-container" href="https://github.com/mncoppola/suterusu">
                    <div class="card-image-container"><div class="card-image"><img src="/pic/card_img%2F1557549385915006977%2FYHtzY60h%3Fformat%3Djpg%26name%3D600x600" alt="" /></div></div>
                    <div class="card-content-container"><div class="card-content">
                        <h2 class="card-title">GitHub - mncoppola&#x2F;suterusu: An LKM rootkit targeting Linux 2.6&#x2F;3.x on x86(_64), and ARM</h2>
                        <p class="card-description">An LKM rootkit targeting Linux 2.6&#x2F;3.x on x86(_64), and ARM - GitHub - mncoppola&#x2F;suterusu: An LKM rootkit targeting Linux 2.6&#x2F;3.x on x86(_64), and ARM</p>
                        <span class="card-destination">github.com</span>
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